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Key's method is simple but effective, and this workout can be done basically anywhere. All you need is a very light resistance band (but you can use a Theraband if that's all you got) and a mat (a towel will suffice). Set yourself up near a door knob or a sturdy desk to attach your resistance band to, ideally waist-high or below. The video above is abridged for demonstration's sake. For optimal results, do the entire circuit three times, resting 30 seconds between exercises and 2-3 minutes between each go-round.